Description
An issue has been found in PowerDNS before 3.4.11 and 4.0.2, and PowerDNS recursor before 4.0.4, allowing an attacker in position of man-in-the-middle to alter the content of an AXFR because of insufficient validation of TSIG signatures. A missing check that the TSIG record is the last one, leading to the possibility of parsing records that are not covered by the TSIG signature.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Open-Xchange | pdns | 3.4.11, 4.0.2, 4.0.4 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | pdns | 4.0.2-1 | — |
| Debian 14 | pdns-recursor | 4.0.4-1 | — |
| Debian 13 | pdns | 4.0.2-1 | — |
| Debian 13 | pdns-recursor | 4.0.4-1 | — |
| Debian 12 | pdns | 4.0.2-1 | — |
| Debian 12 | pdns-recursor | 4.0.4-1 | — |
| Debian 8 | pdns | 3.4.1-4+deb8u7 | DSA-3764-1 |
| Debian 7 | pdns | 3.1-4.1+deb7u3 | DLA-798-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | pdns +1 | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.5 | pdns | 4.0.3-r0 | — |
| Alpine v3.5 | pdns-recursor | 4.0.4-r0 | — |
Advisories 2
- DLA-798-1 pdns - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3764-1 pdns - security update Debian Security (DSA / DLA) · Mar 9, 2026